I am unable to receive any inbound/outbound calls

Your device needs to register with your OCS in order to receive inbound calls and make outbound calls.

Some reasons why your device may not be able to register with the OCS:

Possible power outage

Device may not be plugged in correctly

Internet connectivity has been lost

Router/firewall is blocking the device

Further reasons a device may not receive calls:

DND (Do Not Disturb) may be activated on the device to which incoming calls are routed

A Call Forward may be set either on the device or on the OCS (refer to Call Forwarding)

Only one extension is set to receive incoming calls – if only one extension is set to receive incoming calls, when that extension is busy, incoming calls cannot be received. To resolve this, a Ring Group may be requested (see Requesting a Ring Group)

Steps to take

Reboot your router, and then the phones – try to make a call

Make sure DND is deactivated (if not able to receive calls)

Make sure that Call Forward is deactivated (if not able to receive calls)

Check that the cables are plugged correctly into the device

Check that you have Internet connectivity to the network in which the phones are connected